21212333320 has 64 divisors (see below), whose sum is σ = 48067447680. Its totient is φ = 8424662016.

The previous prime is 21212333293. The next prime is 21212333341. The reversal of 21212333320 is 2333321212.

It is a junction number, because it is equal to n+sod(n) for n = 21212333291 and 21212333300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11869467 + ... + 11871253.

It is an arithmetic number, because the mean of its divisors is an integer number (751053870).

Almost surely, 2^21212333320 is an apocalyptic number.

21212333320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212333320 is an abundant number, since it is smaller than the sum of its proper divisors (26855114360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212333320 is a wasteful number, since it uses less digits than its factorization.

21212333320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742 (or 3738 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21212333320 its reverse (2333321212), we get a palindrome (23545654532).

The spelling of 21212333320 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-three thousand, three hundred twenty".